ar71xx: swizzle address for PCI byte/word access on AR71xx

Closes #11683.

SVN-Revision: 32639

target/linux/ar71xx/patches-3.3/470-MIPS-ath79-swizzle-pci-address-for-ar71xx.patch

@@ -0,0 +1,111 @@
+--- /dev/null
++++ b/arch/mips/include/asm/mach-ath79/mangle-port.h
+@@ -0,0 +1,37 @@
++/*
++ *  Copyright (C) 2012 Gabor Juhos <[email protected]>
++ *
++ *  This file was derived from: inlude/asm-mips/mach-generic/mangle-port.h
++ *      Copyright (C) 2003, 2004 Ralf Baechle
++ *
++ *  This program is free software; you can redistribute it and/or modify it
++ *  under the terms of the GNU General Public License version 2 as published
++ *  by the Free Software Foundation.
++ */
++
++#ifndef __ASM_MACH_ATH79_MANGLE_PORT_H
++#define __ASM_MACH_ATH79_MANGLE_PORT_H
++
++#ifdef CONFIG_PCI
++extern unsigned long (ath79_pci_swizzle_b)(unsigned long port);
++extern unsigned long (ath79_pci_swizzle_w)(unsigned long port);
++#else
++#define ath79_pci_swizzle_b(port) (port)
++#define ath79_pci_swizzle_w(port) (port)
++#endif
++
++#define __swizzle_addr_b(port)	ath79_pci_swizzle_b(port)
++#define __swizzle_addr_w(port)	ath79_pci_swizzle_w(port)
++#define __swizzle_addr_l(port)	(port)
++#define __swizzle_addr_q(port)	(port)
++
++# define ioswabb(a, x)           (x)
++# define __mem_ioswabb(a, x)     (x)
++# define ioswabw(a, x)           (x)
++# define __mem_ioswabw(a, x)     cpu_to_le16(x)
++# define ioswabl(a, x)           (x)
++# define __mem_ioswabl(a, x)     cpu_to_le32(x)
++# define ioswabq(a, x)           (x)
++# define __mem_ioswabq(a, x)     cpu_to_le64(x)
++
++#endif /* __ASM_MACH_ATH79_MANGLE_PORT_H */
+--- a/arch/mips/ath79/pci.c
++++ b/arch/mips/ath79/pci.c
+@@ -13,6 +13,7 @@
+  */
+ 
+ #include <linux/init.h>
++#include <linux/export.h>
+ #include <linux/pci.h>
+ #include <linux/resource.h>
+ #include <linux/platform_device.h>
+@@ -25,6 +26,9 @@ static int (*ath79_pci_plat_dev_init)(st
+ static const struct ath79_pci_irq *ath79_pci_irq_map __initdata;
+ static unsigned ath79_pci_nr_irqs __initdata;
+ 
++static unsigned long (*__ath79_pci_swizzle_b)(unsigned long port);
++static unsigned long (*__ath79_pci_swizzle_w)(unsigned long port);
++
+ static const struct ath79_pci_irq ar71xx_pci_irq_map[] __initconst = {
+ 	{
+ 		.slot	= 17,
+@@ -202,12 +206,50 @@ ath79_register_pci_ar724x(int id,
+ 	return pdev;
+ }
+ 
++static inline bool ar71xx_is_pci_addr(unsigned long port)
++{
++	unsigned long phys = CPHYSADDR(port);
++
++	return (phys >= AR71XX_PCI_MEM_BASE &&
++		phys < AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE);
++}
++
++static unsigned long ar71xx_pci_swizzle_b(unsigned long port)
++{
++	return ar71xx_is_pci_addr(port) ? port ^ 3 : port;
++}
++
++static unsigned long ar71xx_pci_swizzle_w(unsigned long port)
++{
++	return ar71xx_is_pci_addr(port) ? port ^ 2 : port;
++}
++
++unsigned long ath79_pci_swizzle_b(unsigned long port)
++{
++	if (__ath79_pci_swizzle_b)
++		return __ath79_pci_swizzle_b(port);
++
++	return port;
++}
++EXPORT_SYMBOL(ath79_pci_swizzle_b);
++
++unsigned long ath79_pci_swizzle_w(unsigned long port)
++{
++	if (__ath79_pci_swizzle_w)
++		return __ath79_pci_swizzle_w(port);
++
++	return port;
++}
++EXPORT_SYMBOL(ath79_pci_swizzle_w);
++
+ int __init ath79_register_pci(void)
+ {
+ 	struct platform_device *pdev = NULL;
+ 
+ 	if (soc_is_ar71xx()) {
+ 		pdev = ath79_register_pci_ar71xx();
++		__ath79_pci_swizzle_b = ar71xx_pci_swizzle_b;
++		__ath79_pci_swizzle_w = ar71xx_pci_swizzle_w;
+ 	} else if (soc_is_ar724x()) {
+ 		pdev = ath79_register_pci_ar724x(-1,
+ 						 AR724X_PCI_CFG_BASE,